Method of making sinks



J. STANITZ Re. 21,997

METHOD 0F MAKING SINKS, WASHBASINS, AND THE LIKE Jan. 6, 1942.

2 Sheets-Sheet l Original Filed Dec. '7, 1932 2119.1.

Jan. 6 1942. Y J. STANI'IZ METHOD OF MAKING SINKS, WASHBASINS, AND THE LIKE Original File d Dec. 7, 1952 2 Sheets-ShetZ I c9116; 67am Reissued Jan. 6,.1942

UNITEDSTATES PATENT OFFICE f Re. 21,997

METHOD OF MAKING SINKS, WASHBASINS, AND THE LIKE Jacques Stanitz, Warren, Ohio. asslgnor, by mesne assignments, to Steel Plumbing Wares, Inc., a Detroit, Mich, a corporation of Michigan Original No. 1,910,910, dated July 4. 1933, Serial No. 646,207, December 1, 1932.

Application for reissue December 18, 1940, Serial No. 370,733

4 Claims. lotus-"120) This invention relates to improvements in the process of forming sheet metal into sinks, wash basins and the like, of the type which are provided with acomparatively high back lying in a plane substantially at right angles to the plane of the top of the sink or basin.

By the exercise of my improved process, sinks, wash basins, and the like, can be quickly and cheaply formed from a single piece or blank of sheet metal.

Heretofore, in the forming of such devices from a'singlepiece of sheet metal, difliculty has been encountered in the step of bending the back a up into its vertical position. The first step in the manufacture of devices of the kind referred" to from sheet metal is the drawing down of the fluid-receiving bowl. This bowl is ordinarily pro vided with a substantially vertical back wall. Consequently, there is a right angle bend at the upper edge of the wall. It has been found that if the splash-back is bent upwardly to a vertical position at or very near the upper edge of the back wall of this bowl, the metal is. likely to be Y fractured or objectionable bulging or wrinkling may occur. The principal feature of my invention is the provision of a method of manufacture which eliminates this objection.

In the accompanying drawings, I have shown the sink as it appears during the various stages of manufacture. In these drawings-- Figur'e-lis a top plan view of a blank or sheet of metal from which the sink or basin is formed,

' Fig. 11 is a view taken as indicated by the line H of Fig. 9.

As shown in the drawings, Ill may indicate a substantially rectangular blank of sheet metal from which the completed sink is to be formed. In Fig. l, the fluid-receiving bowl II is shown as already completely drawn 'or formed in the blank and is preferably substantially rectangular in shape. The bottom ofv this bowl is indicated by Ila and the back wall thereof by lib. V

After the formation of the fluid-receiving bowl, the blank is trimmed as shown in Fig. 3, principally by making the edges straight, beveling the corners, and cutting the notches I20, lie to define the back panel I! for the splash-back lib and leave suflicient metal for formation of the drainboard, the rim and the apron around the sink, all in the original plane of the blank.

The sink is then formed as shown in Fig. 4. That is, the depending flange I3 is formed around three sides of the back panel l2, a turned rim ll which may have a flat top is formed' around the front .side and ends of the sink, a. generally.

horizontal drain-board and bowl panel lib is formed within the rim, drain grooves It may be formed in thedrain-board between ribs He, and

the apron or depending flange Md is' drawn down around the three sides of the sink. The-depending flange l3 at each end of the back panel I! continues rearward from the depending apron ll at each end of the drain-board and bowl panel llb as shown in Fig. 5.

showing the fluid-receiving bowl drawn therein;

Fig. 2 is a section taken as indicated by the line I of Fig. 1;

Fig. 3 is a view similar to Fig. 1 showing the blanktrimmed for the succeeding operations and also showing in broken lines the location of the lines oi bending and of slitting in the subsequent forming operations; a

Fig. 4 is a top plan view showing the apron, rim, panels and drain grooves formed and, also, the flange for the back Fig. 5 is an end view of the sink partly formed as shown in F18. 4;

Fig. 6 is a view similar to Fig. 5 showing'the slitting of the flanges to permit the bending up of the splash-back;

Fig. '1 is a view similar to Fig. 6 showing the back bent upwardly into its'vertical position;

Fig. 8 is a view similar to Fig. 7 showing pieces welded in the flange on the back;. I I

the finished sink;

The drain-board and bowl panel llb thus formed as shown in Fig. 4, may include a shelf II at the rear of the bowl-and a similar shelf I84 at the end of the bowl opposite the drain grooves l5 and a corresponding shelf lab at the front of the bowl; the drain-board and the shelves are all formed below the plane of the top of the rim ll,

as shown 'after'the first forming operation, in Figs. 4, 9, 10 and 11.

It is .to be particularly noted, however, that the apron lld extends some distance back of the plane of the back wall l lb or the fluidreceiving bowl ll. As shown in Fig.5, the rear ends of the apron lld are indicated by Ila. It will be seen that this lies some distance back of the plane of the wall llb.

And, more important, it is noted that after the forming operations, the metal for the splashback and the metal for the top of the turned rim are both inthe same plane, that is to say, are coplanar.

The flange II on the backis then slit, as in- I dicated by II, where it Joins the apron ltd. The

.of the same.

back panel I! is then bent up into vertical position on the line I'I to form the splash-back panel lib with a rearwardly projecting flange II, which is in the same plane with the depending apron ,ild at each end .of the sink, and a gusset Ila is then welded by its edges to the edges of the slit: l8 to flll the opening between them. It is to be particularly noted that this line H lies back of the plane of the back wall I lbof the fluid-receiving bowl. This leaves a shelf ll back of the fluid-receiving bowl and in front of the splashv back.

If the splash-back panel lib is bent up on a line lying substantially in the same plane as the back wall lib of the bowl, there is very likely to be a fracture, bulging or wrinkling of the metal at the line of the bend. when the bowl is back with a flange around three sides at the rear of the bowl and a turned rim with an apron around three sides of the bowl; then forming a flange around three sides of the splash-back and a turned rim with an apron around three sides of the bowl, the flange being coplanar with the -=apron and the splash-back being coplanar with the top of the rim, at each end of the sink; then slitting the metal between the flange and the apron to but not through the top of the rim; and then bending the splash-back upward along and throughout the length of a longitudinal line lying back of the plane of the back wall of the formed, a right angle bend is made at the top of I theback wall lib of the bowl. If the back is bentup along this line, this causes a straightening of this bend, which is very likely to either weaken or fracture the metal or cause distortion By bending the back wall upward along and throughout the length of a longitudinal line H lying back of the plane of the back wall lib, oi the bowl in the original plane of the blank and extending along the splash-back and through'and across the top of the rim I ,l at each I end of the sink, this, is avoided.

Moreover, it is not necessary tonotch or slit the metal at the junction of the splash-back panel lib with' the top of the turnedrim It to bend the back panel upward, which has heretofore been done, and would necessitate a subsequent welding of the notched or slit metal. This leaves the metal at the Junction or the splash-back and bowl and in the plane of the top of the rim and.

in the original plane of the blank,lsaid line extending along the splash-back and through and across the width of the top of the :rim at each end of the sink to form a substantially vertical splash-back.

3. In a method'of forming sinks, wash basins and the like with a splash-back, from a metal blank, thesteps of drawing down an integral sheet of metal to form a substantially rectangular fluid-receiving bowl, leaving suiflcient metal in the original plane of the blank toiorm a splashback with a flange around three sides at the rear a 01 the bowl, a drainboard at one end of the, bowl.

the rim free of notchinL slitting and welding at this place.

The foregoing detailed description has been given for clearness of understanding only, and

and a turned rim with an apron around three sides of the bowl; then forminga flange around three sidesof'the splansh-back and torming a drainboard at one end of the bowl with a turned rim and an apron around three sides of the drainboard and bowl, the flange being coplanar with the apron and the splash-back being coplanar,

with the top of the rim, at each end of the sink;-

and then bending the splash-back upward along and throughout the length ofa'longitudinal line lying 'backo! the plane of the back wall of the bowl and in the plane'of the top of the rim and in no unnecessarylimitationsshouid be understood therefrom.

What I regard as new and desire to secure by Letters Patent is:

1. In a method of forming sinks, wash basins and the like with a splash-back from a metal blank, the steps or drawing down an integral sheet of metal to form a substantially rectangular fluid-receiving bowl, leaving suflicient metal in the original plane of the blank to form a splashback with a flange around three sides at the rear of thebowl and a turned rim with an apron around three sides of the bowl; then forming a flange aroundthree sides of the splash-back and a turned rim with an apron around three sides of the bowl, the flange being coplanar with the apron and the splash-back being coplanar with the top of the rim, at each end of the sink; and

the original plane of the blank, said line extend ing along the-splash-back and through and across- .the:width of the top of them at each end of the sink to form a substantially vertical Splash back o blank. the steps'of drawing downan integral sheet of metal to. form a substantially rectangular fluid-receiving bowl, leaving sufllcient metal in the original plane of' the blank to form a splashback with a flange around'three sides-.at-the rear of the bowl, a drainboard at oneend of the bowl; and a turned rimwith an apron around three sides of the bowl; then forming a-flange around a three sides of the splash-back and forming a drainboard at one end of the bowl with I. turned rim and an apron around three sidesofthe then bending the splash-back upward along and throughout the length of a longitudinal line lying back of the plane of the back wall of the'bowl and in the plane of the top of the rim and in the original plane of the blank, said line 'extendins along the splash-back and through and across the width of the top of the rim at each end of the sink to form asubstantially vertical splashback. p 2." In a, method of forming sinks, wash basins drainboard and bowl, the flange being coplanar,

with the apron and the splash-back being ooplanar with the top of the rim," at each end of the sink; then-slitting the metal between the lot the rim; and then bending the splash-back flange and the apron to but not through the top upward along and throughout the lengthof a longitudinal line lying back of the plane of the back wall ofthe bowl and in the plane of the top of the rim and in the original plane ofthe blank,

said line extending along the splash-back and and the like with a splash-back from a metal blank, the steps of drawing down an integral sheet of metal to form a substantially rectangular fluidreceiving bowl, leaving suflicient metal in thejpriginal planeptethe blank to form asplaahthrough and across the width of the top of the v a substan-' rim at'each end of the sink to form tially vertical splash-back.

Jacques mum in a method r i'ormingsinks, and the like with a splash-back. from a metal- 

